 International String Figure Association (ISFA)
The ISFA site introduces "String figures" (designs formed from nothing more than a loop of string), with instructions on how to become a member of ISFA and information on email discussion groups and international gatherings, and links to related sites.
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 Interval Computations
What is Interval Arithmetic?; Languages for Interval Analysis; Numerical Toolbox for Verified Computing (information on the book and software; in German and English): Pascal and C++ versions; Interval Software; Roundings Necessary for Interval Computations;
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 janko.at  Angela and Otto Janko
Puzzles, games, and Java applets on logic, number, and chess. See also the Jankos' Retrograde Analysis Corner and analyses of legal moves in chess.
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 Konferenzen, Workshops, Veranstaltungen  DMVFachgruppe Diskrete Mathematik
Listings of discrete math workshops and conferences around the world.
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 (La)TEX Navigator: A (La)TeX Encyclopaedia  Denis Roegel
Resources in French, German, and English. Contents: General documentation about (La)TeX; The (La)TeX local guide of the site (LORIA) (in French); Bibliography and indexes; Literate programming; Classes; Macros and packages; Fonts and symbols; Graphics;
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 Lernen Experimental  Lernen Experimental GmbH
"When blackboard images learned to move ..." Products include software that takes static blackboard images produced during conventional mathematics lessons, and converts them into dynamic, interactive screen experiments. The learning software for the
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 Linear & Nonlinear Programming Publications, Preprints, & FAQs  Technical University of Braunschweig
PostScript files and some abstracts. Many articles in German.
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 LinkSystems International, Inc. (LSI)
Integrated Web publishing, data conversion, and distance learning, specializing in communication of mathematical, scientific, technical, and medical material. Products: NetGroup, a Webbased collaborative work environment, and NetTutor a Webbased tutorial
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 LiveMath  Theorist Interactive, LLC
WebShareable computer algebra and graphing software (formerly MathView/Expressionist / Theorist / MathPlus). LiveMath notebooks may be shared via the Web. They are similar to spreadsheets in that a change in one value will ripple throughout the calculations.
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 Living Graphs  Living Graphs Inc.
Makers of ChaosLab, an interactive math package for visualizing and understanding fractal geometry and chaos theory. This PC software title covers bifurcation diagrams, the chaos game, coin tosses, diffusion limited aggregation, Levy flight, Pascal's
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 Los Elementos de Euclides  Jaume Domenech
Euclid's Elements translated into German, Portuguese, Arabic, Italian, Catalan, Russian, and Chinese. With definitions and illustrative applets.
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 Magische Quadrate  Holger Danielsson
History, definitions, magic sums, transformations, properties, and more. Danielsson provides Flash that uses Hendricks' method to construct your own magic squares: odd, even, doubleeven, singleeven, composite, concentric, mostperfect, bimagic, pandiagonals,
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 Magische Quadrate  Paul Heimbach
Techniques for creating 4x4 and larger magic squares using masks that define areas where a specific number will or will not be added (Jupiter squares and Merkur squares, with many examples of each); art based on magic squares and other mathematical models;
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 Math4U2  University of Applied Science in Augsburg
In German: 2D interactive Java function plotter with animations. Download to run on most computers. It has rich functionality for linear algebra and infinitesimal calculus. Control function parameters and animations. Lessons can be written using XML files
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 MathAssist  Bernd Schultheiss
Math shareware from Germany (English, French, and German versions are available) for secondary level or high school students and teachers. MathAssist helps in solving most of the tasks of algebra, geometry, analysis, stochastics, and linear algebra.
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 Mathe 2000  Müller, Gerhard N.; Steinbring, Heinz; & Wittmann, Erich Ch., University of Dortmund
A brief history and overview of the primary mathematics curriculum adopted by the state of NordrheinWestfalen (Germany) in 1985. Rooted in the ideas of Dewey, Kühnel, Piaget, and Freudenthal, Mathe 2000 approached early math education epistemologically,
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 Mathe Board  Math Community
A German Community helping mathematics students. With discussion board, puzzles, and more.
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 MatheBoard  Rainer Mueller
A public forum for discussion of mathematics. In German.
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 MathEduc Database  ZDM
MathEduc (formerly MATHDI) is the only international reference database offering a worldwide overview of literature on research, theory and practice in mathematics education. MathEduc also covers education in computer science on the elementary level.
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 Mathematical Institutions  ZIB/MathNet
A collection of references to some international mathematical institutions, in the following sections: Mathematical Societies; International Centers and Institutions; University Departments in Germany; Mathematics Centers in Germany.
(The main body of
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 Mathematical Miniatures  Gottfried Helms
Number theory heuristics that "fascinated [the author] by their structural beauty." Download PDFs about tetration; Bernoullinumbers and the Beauty of the Pascalmatrix; Procedures for summation of divergent series using matrices; Mersenne numbers, cyclotomic
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 Mathematical Optimization  Technical University of Brauschweig
Departmental information; current research topics; recent publications (PostScript form); projects; course pages and notes (in German only); conference listings; links to the OptNet Home Page and other related optimization and OR pages.
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 Mathematical Problems  Torsten Sillke
Some in German, most in English. Topics include graph theory, number theory, combinatorics (enumerations), geometry, algorithms and complexity, recreational mathematics, tiling and packing, dissections, probability, algebra, analysis. Also links to "MathNews"
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 Mathematik Übersicht, FrustfreiLernen.de  Dennis Rudolph, Theresa Gruss
In German: more than 500 articles for students of any age. Some videos are also available.
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 Mathematik für die Schule  Kevin Görner
German language explanations for high school mathematics: basics, relations, derivatives, symmetry, and functions.
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 MathematikLehrgang (Logik, Trigonometrie, Lineare Algebra, Analysis)
A mathematics training course in German with online and download versions, for high school and early college, in which all necessary prerequisite knowledge is contained in the course. Also links to German maths sites.
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 Mathematiksoftware S I und SII (vorwiegend Shareware)  Monika Schwarze
Eine Zusammenstellung nützlicher Mathematikprogramme aus dem SharewareMarkt zur Aufarbeitung von Lernrückständen, Wiederholung und Stärkung der Sicherheit mathematischer Rechenroutinen. Vor allen die Programme für die SII dienen der Überprüfung gemachter
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 Mathematik  Tools  Rainer Mueller
Windows Freeware in German. Tangenten, Plotter, Ableitung.
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 Mathematikum
Mathematik zum anfassen. Giant soap bubbles, deceiving mirrors, mysterious bridges and more: check out the fun side of mathematics in Gießen, Germany, and put your hands on more than 120 interactive puzzles and exhibits at the world's first mathematical
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 Mathematik zum Runterladen : Geometrie Programm  Rainer Müller
A free Windows 95/98 program for computing points, vectors, planes, etc. in 3D. Site is in German.
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 Mathematische Basteleien  Juergen Koeller
A collection of puzzles: pentominoes, Rubik's cube, tangrams, magic squares, and more. Many include directions for building a physical model of the puzzle, as well as comments on solutions. Other topics include numeric palindromes and building an origami
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 Mathematisches Woerterbuch
Bidirectional GermanEnglish glossary of technical mathematical terms,
organized by subject. Explanatory text in German.
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 mathepower.com  Markus Hendler
A series of calculators for solving problems, for classes 110. Primarily in German, but with an English version. Themes include: fractions, geometry, equations, arithmetical operations, trigonometry.
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 Mathepower  Markus Hendler
Online calculators for most calculations covered in the first ten years of school, from basic operations through the first stages of algebra. Available in English, German, and French.
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 mathproject  Norbert Steffen
Online textbook with occasional interactive options, focusing (so far) on functions, sequences, continuity, differential and integral calculus, and linear algebra.
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 maths online  University of Vienna, Austria
A modern mathematics learning site on the Web: details of the project, persons and institutions participating, or project proposals (only in German). The Gallery consists of interactive multimedia learning units (Java applets), each of which includes
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 MathXpert: Software to Help You Learn Mathematics
MathXpert helps students learn algebra, trigonometry, and onevariable calculus by supporting their development of stepbystep solutions. For Windows or Windows emulators. Also available from http://www.mathxpert.com/.
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 Mayan Dating, Mayan Astronomy  Bohumil and Vladimir Bohm
Articles describing the calculation of the correlation between the Mayan and Christian systems of dating, and the results of Mayan Astronomy in the Dresden Codex and the Correlation between the Mayan and Christian Systems of Dating. In English, Spanish,
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 MendelWeb  Roger B. Blumberg
An educational resource for teachers and students interested in the origins of classical genetics, introductory data analysis, elementary plant science, and the history and literature of science. Constructed around Gregor Mendel's 1865 paper "Versuche
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 Metric conversion  Dejan Posedi
Convert units of length, weight, speed, temperature, time, volume, area, power and energy. Also available in German.
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 MiMa  Museum for Minerals and Mathematics Oberwolfach
This German museum's exhibits about mathematics, which focus on symmetry and crystallography, have included IMAGINARY; SURFER, a realtime ray tracer of algebraic surfaces; Cinderella & Curved Spaces; jReality; Morenaments; Doppelpendel; Penrose Puzzle;
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 Multiplication of Decimals  H. B. Meyer, FaustGymnasium Staufen (Mhb)
Interactive training: multiplication of decimals (requires JavaScript). The user has to fill in boxes with proper digits to practice the multiplication algorithm. Problems may be posed either by the user or by the computer. A German version is available.
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 My Magic Square  Michael Dormann
Enter a number from 23 to 100, then press the calculate button to see a completed 4x4 magic square, of which any row, column, diagonal, the center square, and the four corners each sums to the number entered.
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 Nonlinear Physics Group  Technical University, Darmstadt, Germany
A research group whose research areas include sonoluminescence, levitated drops, and acoustic and optically induced cavitation (view MPEG movies of bubbles!) A Java applet, Nonlinear Dynamics Online, provides visualizations of data sets: you may use
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 Number World  David Geistert
Key in any positive integer less than 10^15 and press the "Look up" button for properties about it: factorization, divisors, cross sum, equivalence in multiple bases, and more. Number World's math tools include an equation solver, an equation system solver,
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 OberPrima Mathematik  Olaf Hinrichsen
Instructional German language math videos, browseable by klasse or searchable by keyword.
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 .oO worksheeps  Felix Heckert
Generate worksheets of customized math exercises, complete with solutions: basic operations with integers, negatives, and fractions; binomial and quadratic formulas; partial roots; percent calculation; curve sketching; metric; derivations; antiderivatives;
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 OptNet  Michael Jünger; SIGOPT, Deutsche Mathematiker Vereinigung (DMV)
An electronic forum for the optimization community organized by SIGOPT under the auspices of the Deutsche Mathematiker Vereinigung (DMV). The basic services are a weekly digest containing a moderated list of contributions, a unique email address and
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 Place Value Chart  Ulrich Kortenkamp
Tap below this interactive place value chart app's headers labeled "ones," "tens," and "hundreds" to create tokens and begin experiencing bundling and debundling in our decimal number system. Compatible with the Apple iPhone, iPod, and iPad; also available
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 Plastelina Logic Games  Plastelina
Free Flash games include classic constrained "crossing" problems, such as the puzzle of ferrying a wolf, a sheep, and a head of cabbage across a river in a boat that only holds any two of them at once, without leaving the wolf and sheep alone in each
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